Title:	Coherent population oscillations and superluminal light in a protein complex
Authors:	Yelleswarapu, Chandra S. Laoui, S. Philip, Reji Rao, D.V.G.L.N.
Keywords:	Coherent optical effects Optical nonlinearities in organic materials Pulse propagation and temporal solitons Biomaterials
Issue Date:	Mar-2008
Publisher:	Optical Society of America (OSA)
Citation:	Optics Express, 2008, Vol.16, p3844
Abstract:	We observed superluminal light in aqueous solution of the protein complex bacteriorhodopsin (bR) at 647.1 nm wavelength where it exhibits reverse saturable behavior, exploiting the technique of coherent population oscillations (CPO). With a modulation frequency of 10 Hz, the signal pulse through a 1 cm path cell is ahead by 3 msec relative to the reference pulse, corresponding to a group velocity of -3.3 m/sec. Following our early work on slow light in the same sample at the saturable wavelength 568.2 nm, we now explicitly observed the narrow spectral hole in the absorption band of the stable B state and further, demonstrated a close correlation between the profile of the hole and the corresponding pulse delay for various modulation frequencies. A similar behavior is observed for superluminal light versus antihole blown in the absorption band.
Description:	Restricted Access. The article is open access at the journal site (alternative location)
URI:	http://hdl.handle.net/2289/3567
ISSN:	E-ISSN: 1094-4087
Alternative Location:	http://dx.doi.org/10.1364/OE.16.003844
Copyright:	2008 Optical Society of America
Appears in Collections:	Research Papers (LAMP)

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